Identification_Information: Citation: Citation_Information: Originator: U.S. Geological Survey, Central Energy Resources Team Originator: Johnson, E.A. Originator: Roberts, L.N.R. Originator: Brownfield, M.E. Publication_Date: 2000 Title: yam*_fin (Final unioned file for Yampa coal field resource calculations) Geospatial_Data_Presentation_Form: map Publication_Information: Publication_Place: Denver, CO USA Publisher: U.S. Geological Survey Other_Citation_Details: In subdir 500k (defines appropriate maximum scale for data use) chap. P, Geology and resource assessment of the middle and upper coal groups in the Yampa coal field, northwestern Colorado Larger_Work_Citation: Citation_Information: Originator: Kirschbaum, M.A. Originator: Roberts, L.N.R. Originator: Biewick, L.R.H. Publication_Date: 2000 Title: Geologic Assessment of Coal in the Colorado Plateau Series_Information: Series_Name: U.S. Geological Survey Professional Paper Issue_Identification: 1625-B Publication_Information: Publication_Place: Denver, CO Publisher: U.S. Geological Survey Description: Abstract: These are shapefiles and final unioned polygon coverages used to calculate coal resources of the A through D coal zones, Yampa coal field, northwestern Colorado. Yama_fin was used for the A coal zone, yamb_fin was used for the B coal zone, etc. Polygons that make up the final unioned polygons include counties, 7.5' quadrangles, townships, surface and coal ownership, leased areas, net coal thickness categories, and overburden categories. The final unioned coverage for each coal zone, was clipped by the resource boundary polygon of each coal zone. These polygons are described in the metadata files for the yam_bnd coverages. Purpose: The Nation's coal resources are being assessed by the USGS. This assessment identifies and characterizes the coal beds and coal zones that will provide the bulk of the nation's coal-derived energy during the next century. This assessment is different from previous large-scale USGS assessments because files and databases are being stored in a digital format and are being analyzed using a Geographic Information System (GIS). Time_Period_of_Content: Time_Period_Information: Range_of_Dates/Times: Beginning_Date: 19950000 Ending_Date: 19980000 Currentness_Reference: Processing Date Status: Progress: Complete Maintenance_and_Update_Frequency: None planned Spatial_Domain: Bounding_Coordinates: West_Bounding_Coordinate: -107.8897 East_Bounding_Coordinate: -106.9577 North_Bounding_Coordinate: 40.6013 South_Bounding_Coordinate: 40.2496 Keywords: Theme: Theme_Keyword_Thesaurus: None Theme_Keyword: coal Theme_Keyword: National Coal Resource Assessment Theme_Keyword: NCRA Theme_Keyword: coal thickness Place: Place_Keyword_Thesaurus: None Place_Keyword: Colorado Place_Keyword: Green River Basin Place_Keyword: Sand Wash Basin Place_Keyword: Yampa coal field Place_Keyword: Routt County Place_Keyword: Moffat County Place_Keyword: Rio Blanco County Stratum: Stratum_Keyword_Thesaurus: Geologic Names Unit Lexicon (GNULEX) Stratum_Keyword: Mesaverde Group Stratum_Keyword: Williams Fork Formation Stratum_Keyword: Iles Formation Stratum_Keyword: Trout Creek Sandstone Mbr. Stratum_Keyword: Twentymile Sandstone Mbr. Access_Constraints: None Use_Constraints: Appropriate maximum scale for data use is 500k. No restrictions, however, comparison with other data sets on surface and mineral ownership for the same area from other time periods might be inaccurate due to inconsistencies resulting from changes in land and mineral ownership and in mapping convention over time. Point_of_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Person: Johnson, E.A. Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4857 Security_Information: Security_Handling_Description: None Security_Classification: Unclassified Security_Classification_System: None Native_Data_Set_Environment: SunOS, 5.5.1, sun4d UNIX, ARC/INFO version 7.0.4 and ArcView 3.1 Data_Quality_Information: Attribute_Accuracy: Attribute_Accuracy_Report: See Entity_Attribute_Information Logical_Consistency_Report: Polygon topology present. Completeness_Report: Complete Lineage: Process_Step: Process_Description: An x, y extent greater than the resource area was used to begin the unioning process and was clipped, as a last step, by the polygon that limits the resource area. County data used in unioned polygons are described in metadata file yam_cnty.met. Township and range data are described in yam_tr.met and was unioned with the County coverage. 7.5 minute quadrangle data are described in yam24qd.met and was unioned with the previously unioned coverage. Process_Date: 19980000 Process_Step: Process_Description: A surface and mineral ownership coverage of the Yampa coal field was created from two ARC/INFO coverages received from the Bureau of Land Management (BLM), Craig District Office. The ownership coverages are for the Little Snake River Resource Area (LSRA) of the BLM. Contact at BLM - Pam Levitt, Craig District Office. The BLM LSRA land and mineral ownership data was 24,000 scale in the 1980's by contractor in the Lambert projection. The data was converted to AMS (Automated Mapping System) in the early 1990's where it was combined with Mineral ownership to create a Land lines theme. The data was once again converted when BLM switched over the ADS (Automated Digitizing System). The data was converted to UTM Zone 13 when it was converted to ADS. At that point the data was snapped to a digitized PLS (Public Land Survey). Once the data was verified it was converted and used in MOSS (Map Overlay Statistical System) in the mid 1990's. All the individual 24k quads were merged together in MOSS and then converted to a MOSS export format. The data was FTP'd from the PRIME in Denver to a local PC and run through the MOSS2DXF translator. Once the data was in an AutoCAD format the individual segments were joined into continuous lines and the interior lines separating mineral status were removed. The data was then snapped to the AutoCAD GCDB (Geographic Coordinate Data Base) layer. Once the BLM converted to the UNIX based ARC/INFO GIS system the data was brought in. A DXF file was made in AutoCAD and brought into ARC/INFO utilizing the DXFARC command. The ADS files were converted to the UNIX based ARC/INFO system in 1996-1997. Once the landlines coverage was brought into ARC the landstatus lines were removed to create a separate mineral status layer. Problems occurred while using the dissolve command so all work was done in ARCEDIT by hand. Once the individual quads were cleaned they were merged into 100K blocks. At this point the dissolve command had been fixed so dissolve was used in the merged 100K maps. Once those maps were clean they were once again merged and DISSOLVEd and CLEANed creating a Resource Area Wide coverage. Within the Yampa and Danforth Hills coal assessment areas, the USGS UNIONed the surface and mineral ownership coverages and processed sliver areas by snapping to the surface data. USGS incorporated updated BLM data that was received 4/98. Data was verified by the various BLM offices in 12/98. This coverage was snapped to the township lines that the USGS used for the Piceance basin (see metadata file yam_tr.met). The resultant ownership coverage was unioned with the coverage containing county, 7.5' quadrangle, and township data. Process_Date: 19980000 Process_Step: Process_Description: A coverage was then unioned to the previously unioned coverage that is polygons of the state and federal coal leases and the mined-out areas in the Yampa coal field. This coverage is described in yam_leas.met. Coal resources were not calculated within the boundaries of the leased and mined-out areas. Process_Date: 19980000 Process_Step: Process_Description: A coverage was generated from a gridded file of data representing the overburden thickness to the base of each of the coal zones. The overburden grid for the base of the A coal zone is a result of subtracting the grid for the top of the Trout Creek Sandstone (SS) Mbr. (base of the A coal zone) from the grid of the earth's surface in EarthVision (EV). The surface grid is a 250k Digital Elevation Model of the Yampa study area imported through EV. The overburden grid for the base of the B coal zone is a result of adding the grid file for the combined thickness of the A coal zone and the A barren interval to the gridded surface of the top of the Trout Creek SS Mbr. This process results in a 'pseudo' structure grid for the base of the B coal zone. This grid was subtracted from the grid of the surface topography to create an overburden grid to the base of the B coal zone. The base of the C zone is equivalent to the horizon for the top of the Twentymile SS Mbr. in the Yampa coal field. The overburden grid for the base of the C coal zone is a result of adding the grid file for the thickness of the interval between the top of the Trout Creek SS Mbr. and the top of the Twentymile SS Mbr. to the top of the gridded surface of the Trout Creek SS Mbr. This process results in a 'pseudo' structure grid for the base of the C coal zone. This grid was subtracted from the grid of the surface topography to create an overburden grid to the base of the C coal zone. The base of the D zone is equivalent to the horizon for the top of the Big White sandstone (also known as Fuhr Gulch or Fish Creek sandstone) in the Yampa coal field. The overburden grid for the base of the D coal zone is a result of adding the grid file for the thickness of the interval between the top of the Trout Creek SS Mbr. and the top of the Big White sandstone (aka, Fuhr Gulch or Fish Creek sandstone) to the top of the gridded surface of the Trout Creek SS. This process results in a 'pseudo' structure grid for the base of the D coal zone. This grid was subtracted from the grid of the surface topography to create an overburden grid to the base of the D coal zone. Maps of the overburden for each coal zone was plotted in EV with a contour interval of 500 ft. The contour lines were saved in a contour output file. The contour output file was converted to a file in 'arc generate' format using ISMARC and then converted to an ARC/INFO polygon coverage using an Arc Macro Language (AML) program from the Illinois State Geological Survey. In ARC/INFO, the overburden coverages were unioned with the previously unioned coverages that contain polygon data for County, 7.5' quadrangles, Townships, surface and mineral ownership, and leased areas. Process_Date: 19980000 Process_Step: Process_Description: A coverage was generated from a gridded file of data from drill holes and measured sections that contain x, y, data for location and values for the net coal thickness for each of the coal zones. Details about how this data file was generated from the Stratifact data base are described in the metadata files Yam_thk.met EarthVision was used to do the gridding. The net coal thickness does not include coal beds that are less than resource thickness, which for bituminous coal is 1.2 ft. Contours defining the net coal thickness categories for bituminous coal from USGS circular 891, were generated from the grid. These contour lines include 1.2 ft, 2.3, 3.5, 7.0, and 14.0. The contour lines were saved in a contour output file. The contour output file was converted to a file in 'arc generate' format using ISMARC and then converted to an ARC/INFO polygon coverage using an Arc Macro Language (AML) program from the Illinois State Geological Survey. This polygon coverage was unioned with the coverage created from the previous union. Process_Date: 19980000 Process_Step: Process_Description: The ARC/INFO polygon coverages generated from all these unions were then clipped using the Arc 'identity' command. The 'input' coverage is described in a metadata file called yam_bnd.met. The 'identity' coverages are the final unioned polygons. The 'output' coverages are these yama_fin, yamb_fin, yamc_fin, and yamd_fin polygon coverages. These coverages were converted to shapefiles in ArcView. Process_Date: 19980000 Spatial_Data_Organization_Information: Direct_Spatial_Reference_Method: Vector Point_and_Vector_Object_Information: SDTS_Terms_Description: SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains Point_and_Vector_Object_Count: 1421 Spatial_Reference_Information: Horizontal_Coordinate_System_Definition: Geographic: Latitude_Resolution: .0001 Longitude_Resolution: .0001 Geographic_Coordinate_Units: Decimal degrees Geodetic_Model: Horizontal_Datum_Name: North American Datum 1927 Ellipsoid_Name: Clarke 1866 Semi-major_Axis: 6378206.4 Denominator_of_Flattening_Ratio: 294.98 Entity_and_Attribute_Information: Detailed_Description: Entity_Type: Entity_Type_Label: yam*_fin.dbf Entity_Type_Definition: Shapefile Attribute Table Entity_Type_Definition_Source: None Attribute: Attribute_Label: Area Attribute_Definition: Area of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00000 Range_Domain_Maximum: 0.00382 Attribute: Attribute_Label: Perimeter Attribute_Definition: Perimeter of polygon Attribute_Definition_Source: Software computed Attribute_Domain_Values: Range_Domain: Range_Domain_Minimum: 0.00347 Range_Domain_Maximum: 0.74247 Attribute: Attribute_Label: Cntyname Attribute_Definition: County name Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Attribute: Attribute_Label: Name Attribute_Definition: 7.5 minute quadrangle name Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Attribute: Attribute_Label: Block Attribute_Definition: Township and Range block N - north S - south E - east W - west Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Attribute: Attribute_Label: Surf Attribute_Definition: Surface ownership BLM - US Bureau of Land Management FS - US Forest Service DOE - US Department of Energy BREC - US Bureau of Reclamation SDOW - State Department of Wildlife STATE - State PRIVATE - Private Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Attribute: Attribute_Label: Fedmins Attribute_Definition: Federal mineral ownership ALL - Federal government owns all minerals COAL - Federal government owns the coal only OGC - Federal government owns the oil, gas, and coal only OG - Federal government owns oil and gas only NONE - Federal government owns none of the minerals OTHER - other Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Attribute: Attribute_Label: Overb Attribute_Definition: Overburden categories - range of overburden to base of coal zones. Thickness of overburden in 100s of feet. Attribute_Definition_Source: User Defined Attribute_Domain_Values: Unrepresentable_Domain: Character field Distribution_Information: Distributor: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4608 Resource_Description: Shapefile and ARC/INFO coverage Distribution_Liability: Any use of trade, product, or company names in this publication is for descriptive purposes only and does not imply endorsement by the U.S. Government. Although these data have been processed successfully on a computer system at the U.S. Geological Survey, no warranty expressed or implied is made by the USGS regarding the utility of the data on any other system, nor shall the act of distribution constitute any such warranty. Comparison with other data set on surface and mineral ownership for the same area from other time periods might be inaccurate due to inconsistencies resulting from changes in land and mineral ownership and in mapping convention over time. This data is not a legal document and is not intended to be used as such. Standard_Order_Process: Digital_Form: Digital_Transfer_Information: Format_Name: ARC/INFO coverage, export file and shapefile Format_Version_Number: ARC/INFO 7.0.4, ArcView 2.1 Digital_Transfer_Option: Offline_Option: Offline_Media: CD-ROM Recording_Format: ISO 9660 Fees: none Technical_Prerequisites: need ARC/INFO 7.0.4 or greater and/or ArcView 2.1 or greater and/or ArcExplorer (which can be downloaded free from ) and/or other software that can read ARC/INFO coverages, ARC/INFO export files, and/or shapefiles Metadata_Reference_Information: Metadata_Date: 19990203 Metadata_Contact: Contact_Information: Contact_Organization_Primary: Contact_Organization: U.S. Geological Survey, Central Energy Contact_Address: Address_Type: mailing and physical address Address: PO Box 25046 MS 939 Denver Federal Center City: Denver State_or_Province: CO Postal_Code: 80225 Country: USA Contact_Voice_Telephone: 303.236.4608 Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata Metadata_Standard_Version: FGDC-STD-001-1998 Metadata_Access_Constraints: None Metadata_Security_Information: Metadata_Security_Handling_Description: None Metadata_Security_Classification: Unclassified Metadata_Security_Classification_System: None ------------------------------------------------------------------------ Generated by mp version 2.4.8 on Thu Oct 14 11:55:43 1999